Neither have I. I've rented them a lot and never had issues.
One time I rented a scooter on one of the islands. And I found a spot in the road that was basically a ramp. I was jumping the shooter off of it. Turns out I scuffed up one of the fairings on the bottom of the bike. So I did damage the bike. He had a photocopy of the parts list and charged me a $100 for the damage. I was being an idiot and did damage so I didn't have a problem paying it. I ended up paying less than the replacement price. Do they order the parts and fix it ? Not usually. But that's besides the point. Damage devalues the bike.
Another time , the clutch cable snapped on a big bike I rented. I hobbled it back to the place and they exchanged the bike no problem. They probably knew the bike had a iffy cable. They could have fuct me around and said I wrecked it. But they didn't